<template>
  <form-item-wrapper
    :designer="designer"
    :field="field"
    :rules="rules"
    :design-state="designState"
    :parent-widget="parentWidget"
    :parent-list="parentList"
    :index-of-parent-list="indexOfParentList"
    :sub-form-row-index="subFormRowIndex"
    :sub-form-col-index="subFormColIndex"
    :sub-form-row-id="subFormRowId"
  >
    <!-- el-upload增加:name="field.options.name"后，会导致又拍云上传失败！故删除之！！ -->
    <el-upload
      ref="fieldEditor"
      :disabled="field.options.disabled"
      :style="styleVariables"
      class="dynamicPseudoAfter"
      :action="realUploadURL"
      :headers="uploadHeaders"
      :data="uploadData"
      :with-credentials="field.options.withCredentials"
      :multiple="field.options.multipleSelect"
      :file-list="fileList"
      :show-file-list="field.options.showFileList"
      :class="{ hideUploadDiv: uploadBtnHidden }"
      :limit="field.options.limit"
      :on-exceed="handleFileExceed"
      :before-upload="beforeFileUpload"
      :on-success="handleFileUpload"
      :on-error="handleUploadError"
    >
      <template #tip>
        <div class="el-upload__tip" v-if="!!field.options.uploadTip">
          {{ field.options.uploadTip }}
        </div>
      </template>
      <template #default>
        <svg-icon icon-class="el-plus" /><i
          class="el-icon-plus avatar-uploader-icon"
        />
      </template>
      <template #file="{ file }">
        <div class="upload-file-list">
          <span class="upload-file-name" :title="file.name">{{
            file.name
          }}</span>
          <a :href="file.url" download="" target="_blank">
            <span
              class="el-icon-download file-action"
              :title="i18nt('render.hint.downloadFile')"
            >
              <svg-icon icon-class="el-download" /> </span
          ></a>
          <span
            class="file-action"
            :title="i18nt('render.hint.removeFile')"
            v-if="!field.options.disabled"
            @click="removeUploadFile(file.name, file.url, file.uid)"
            ><svg-icon icon-class="el-delete"
          /></span>
        </div>
      </template>
    </el-upload>
  </form-item-wrapper>
</template>

<script>
import FormItemWrapper from "./form-item-wrapper.vue";
import emitter from "@/utils/emitter";
import i18n, { translate } from "@/utils/i18n";
import { deepClone, evalFn } from "@/utils/util";
import fieldMixin from "@/components/form-designer/form-widget/field-widget/fieldMixin";
import SvgIcon from "@/components/svg-icon/index.vue";

const selectFileText = "'" + translate("render.hint.selectFile") + "'";

export default {
  name: "file-upload-widget",
  componentName: "FieldWidget", //必须固定为FieldWidget，用于接收父级组件的broadcast事件
  mixins: [emitter, fieldMixin, i18n],
  props: {
    field: Object,
    parentWidget: Object,
    parentList: Array,
    indexOfParentList: Number,
    designer: Object,

    designState: {
      type: Boolean,
      default: false
    },

    subFormRowIndex: {
      /* 子表单组件行索引，从0开始计数 */ type: Number,
      default: -1
    },
    subFormColIndex: {
      /* 子表单组件列索引，从0开始计数 */ type: Number,
      default: -1
    },
    subFormRowId: {
      /* 子表单组件行Id，唯一id且不可变 */ type: String,
      default: ""
    }
  },
  components: {
    SvgIcon,
    FormItemWrapper
  },
  data() {
    return {
      oldFieldValue: null, //field组件change之前的值
      fieldModel: [],
      rules: [],

      uploadHeaders: {},
      uploadData: {
        key: "" //七牛云上传文件名
        //token: '',  //七牛云上传token

        //policy: '',  //又拍云上传policy
        //authorization: '',  //又拍云上传签名
      },
      fileList: [], //上传文件列表
      uploadBtnHidden: false,

      styleVariables: {
        "--select-file-action": selectFileText
      }
    };
  },
  computed: {
    realUploadURL() {
      let uploadURL = this.field.options.uploadURL;
      if (
        !!uploadURL &&
        (uploadURL.indexOf("DSV.") > -1 || uploadURL.indexOf("DSV[") > -1)
      ) {
        let DSV = this.getGlobalDsv();
        console.log("test DSV: ", DSV); //防止DSV被打包工具优化！！！
        return evalFn(this.field.options.uploadURL, DSV);
      }

      return this.field.options.uploadURL;
    }
  },
  beforeCreate() {
    /* 这里不能访问方法和属性！！ */
  },

  created() {
    /* 注意：子组件mounted在父组件created之后、父组件mounted之前触发，故子组件mounted需要用到的prop
         需要在父组件created中初始化！！ */
    this.initFieldModel();
    this.registerToRefList();
    this.initEventHandler();
    this.buildFieldRules();

    this.handleOnCreated();
  },

  mounted() {
    this.handleOnMounted();
  },

  beforeUnmount() {
    this.unregisterFromRefList();
  },

  methods: {
    handleFileExceed() {
      let uploadLimit = this.field.options.limit;
      this.$message.warning(
        this.i18nt("render.hint.uploadExceed").replace(
          "${uploadLimit}",
          uploadLimit
        )
      );
    },

    beforeFileUpload(file) {
      let fileTypeCheckResult = false;
      let extFileName = file.name.substring(file.name.lastIndexOf(".") + 1);
      if (!!this.field.options && !!this.field.options.fileTypes) {
        let uploadFileTypes = this.field.options.fileTypes;
        if (uploadFileTypes.length > 0) {
          fileTypeCheckResult = uploadFileTypes.some(ft => {
            return extFileName.toLowerCase() === ft.toLowerCase();
          });
        }
      }
      if (!fileTypeCheckResult) {
        this.$message.error(
          this.i18nt("render.hint.unsupportedFileType") + extFileName
        );
        return false;
      }

      let fileSizeCheckResult = false;
      let uploadFileMaxSize = 5; //5MB
      if (!!this.field.options && !!this.field.options.fileMaxSize) {
        uploadFileMaxSize = this.field.options.fileMaxSize;
      }
      fileSizeCheckResult = file.size / 1024 / 1024 <= uploadFileMaxSize;
      if (!fileSizeCheckResult) {
        this.$message.error(
          this.i18nt("render.hint.fileSizeExceed") + uploadFileMaxSize + "MB"
        );
        return false;
      }

      this.uploadData.key = file.name;
      return this.handleOnBeforeUpload(file);
    },

    handleOnBeforeUpload(file) {
      if (!!this.field.options.onBeforeUpload) {
        let bfFunc = new Function("file", this.field.options.onBeforeUpload);
        let result = bfFunc.call(this, file);
        if (typeof result === "boolean") {
          return result;
        } else {
          return true;
        }
      }

      return true;
    },

    updateFieldModelAndEmitDataChangeForUpload(
      fileList,
      customResult,
      defaultResult
    ) {
      let oldValue = deepClone(this.fieldModel);
      if (!!customResult && !!customResult.name && !!customResult.url) {
        this.fieldModel.push({
          name: customResult.name,
          url: customResult.url
        });
      } else if (
        !!defaultResult &&
        !!defaultResult.name &&
        !!defaultResult.url
      ) {
        this.fieldModel.push({
          name: defaultResult.name,
          url: defaultResult.url
        });
      } else {
        this.fieldModel = deepClone(fileList);
      }

      this.syncUpdateFormModel(this.fieldModel);
      this.emitFieldDataChange(this.fieldModel, oldValue);
    },

    handleFileUpload(res, file, fileList) {
      if (file.status === "success") {
        let customResult = null;
        if (!!this.field.options.onUploadSuccess) {
          let mountFunc = new Function(
            "result",
            "file",
            "fileList",
            this.field.options.onUploadSuccess
          );
          customResult = mountFunc.call(this, res, file, fileList);
        }

        this.updateFieldModelAndEmitDataChangeForUpload(
          fileList,
          customResult,
          res
        );
        if (!!customResult && !!customResult.name) {
          file.name = customResult.name;
        } else {
          file.name = file.name || res.name || res.fileName || res.filename;
        }
        if (!!customResult && !!customResult.url) {
          file.url = customResult.url;
        } else {
          file.url = file.url || res.url;
        }
        this.fileList = deepClone(fileList);
        this.uploadBtnHidden = fileList.length >= this.field.options.limit;
      }
    },

    updateFieldModelAndEmitDataChangeForRemove(deletedFileIdx, fileList) {
      let oldValue = deepClone(this.fieldModel);
      this.fieldModel.splice(deletedFileIdx, 1);
      this.syncUpdateFormModel(this.fieldModel);
      this.emitFieldDataChange(this.fieldModel, oldValue);
    },

    removeUploadFile(fileName, fileUrl, fileUid) {
      let foundIdx = -1;
      let foundFile = null;
      this.fileList.forEach((file, idx) => {
        if (
          file.name === fileName &&
          (file.url === fileUrl || (!!fileUid && file.uid === fileUid))
        ) {
          foundIdx = idx;
          foundFile = file;
        }
      });

      if (foundIdx >= 0) {
        this.fileList.splice(foundIdx, 1);
        this.updateFieldModelAndEmitDataChangeForRemove(
          foundIdx,
          this.fileList
        );
        this.uploadBtnHidden = this.fileList.length >= this.field.options.limit;

        if (!!this.field.options.onFileRemove) {
          let customFn = new Function(
            "file",
            "fileList",
            this.field.options.onFileRemove
          );
          customFn.call(this, foundFile, this.fileList);
        }
      }
    },

    handleUploadError(err, file, fileList) {
      if (!!this.field.options.onUploadError) {
        let customFn = new Function(
          "error",
          "file",
          "fileList",
          this.field.options.onUploadError
        );
        customFn.call(this, err, file, fileList);
      } else {
        this.$message({
          message: this.i18nt("render.hint.uploadError") + err,
          duration: 3000,
          type: "error"
        });
      }
    }
  }
};
</script>

<style lang="scss" scoped>
@import "../../../../style/global.scss"; /* form-item-wrapper已引入，还需要重复引入吗？ */

.full-width-input {
  width: 100% !important;
}

.dynamicPseudoAfter :deep(.el-upload.el-upload--text) {
  color: $--color-primary;
  font-size: 12px;
  .el-icon-plus:after {
    content: var(--select-file-action);
  }
}

.hideUploadDiv {
  :deep(div.el-upload--picture-card) {
    /* 隐藏最后的图片上传按钮 */
    display: none;
  }

  :deep(div.el-upload--text) {
    /* 隐藏最后的文件上传按钮 */
    display: none;
  }

  :deep(div.el-upload__tip) {
    /* 隐藏最后的文件上传按钮 */
    display: none;
  }
}

.upload-file-list {
  font-size: 12px;

  .file-action {
    color: $--color-primary;
    margin-left: 5px;
    margin-right: 5px;
    cursor: pointer;
  }
}
</style>
